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Hochschule Düsseldorf
University of Applied Sciences


Fachbereich Medien
Faculty of Media

Labor für Virtuelles Studio / Virtuelle Realität

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Abstract: A filtering model for efficient rendering of the spatial image of an occluded virtual sound source

William L. Martens, Jens Herder, and Yoshiki Shiba. A filtering model for efficient rendering of the spatial image of an occluded virtual sound source, 137th Meeting of the Acoustical Society of America and the 2nd Convention of the European Acoustics Association, Berlin, March 1999.

Rendering realistic spatial sound imagery for complex virtual environments must take into account the effects of obstructions such as reflectors and occluders. It is relatively well understood how to calculate the acoustical consequence that would be observed at a given observation point when an acoustically opaque object occludes a sound source. But the interference patterns generated by occluders of various geometries and orientations relative to the virtual source and receiver are computationally intense if accurate results are required. In many applications, however, it is sufficient to create a spatial image that is recognizable by the human listener as the sound of an occluded source. In the interest of improving audio rendering efficiency, a simplified filtering model was developed and its audio output submitted to psychophysical evaluation. Two perceptually salient components of occluder acoustics were identified that could be directly related to the geometry and orientation of a simple occluder. Actual occluder impulse responses measured in an anechoic chamber resembled the responses of a model incorporating only a variable duration delay line and a low-pass filter with variable cutoff frequency.


audio rendering, occluder, first-order reflection, and human perception

Full paper: [Postscript gzip] [Video]



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